import 'package:flutter/material.dart';

import 'zen_style.dart';

/// A tab's big title and an optional line under it.
class PageHeader extends StatelessWidget {
  const PageHeader({super.key, required this.title, this.subtitle, this.action});

  final String title;
  final String? subtitle;

  /// A button beside the title, such as "New plan".
  final Widget? action;

  @override
  Widget build(BuildContext context) {
    final s = ZenStyle.of(context);
    final text = Theme.of(context).textTheme;
    return Padding(
      padding: const EdgeInsets.fromLTRB(20, 28, 20, 16),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Row(
            children: [
              Expanded(child: Text(title, style: text.headlineLarge)),
              if (action != null) ...[const SizedBox(width: 12), action!],
            ],
          ),
          if (subtitle != null) ...[
            const SizedBox(height: 6),
            Text(subtitle!, style: text.bodyLarge?.copyWith(color: s.inkMuted)),
          ],
        ],
      ),
    );
  }
}

/// What an empty tab shows: what will appear here and how to get it there.
class EmptyState extends StatelessWidget {
  const EmptyState({super.key, required this.icon, required this.title, required this.body});

  final IconData icon;
  final String title;
  final String body;

  @override
  Widget build(BuildContext context) {
    final s = ZenStyle.of(context);
    final text = Theme.of(context).textTheme;
    return Padding(
      padding: const EdgeInsets.symmetric(horizontal: 20),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Container(
            width: 56,
            height: 56,
            decoration: BoxDecoration(
              color: s.surfaceSoft,
              borderRadius: BorderRadius.circular(s.controlRadius.clamp(0, 28)),
            ),
            child: Icon(icon, color: s.accent),
          ),
          const SizedBox(height: 16),
          Text(title, style: text.titleLarge),
          const SizedBox(height: 6),
          ConstrainedBox(
            constraints: const BoxConstraints(maxWidth: 340),
            child: Text(body, style: text.bodyMedium?.copyWith(color: s.inkMuted)),
          ),
        ],
      ),
    );
  }
}